API Std 650 low-alloy steel tanks equipped with a fixed roof

Floating roofs shall comply with API standard 650, Appendix C (Attachment 01) or with the API Std 650 low-alloy steel tanks requirements as layed (laid )down in the national Chinese specifications SH3046-92 and GBJ128-90.

The thickness of the API Std 650 low-alloy steel tanks annular bottom plates shall be in accordance with Table Q-4 (for steel or aluminum, as applicable). The thicknesses shown are minimums. The ring of annual plates shall have a circular outside circumference, but it may have a regular polygonal shape inside the tank shell with the number of sides equal to the number of annular plates. These pieces shall be butt-welded in accordance with Q.7.1.1, Item b. The plates of the first shell course shall be attached to the annular bottom plates by a weld as required by API 620 oil tank 5.9.5 except when a full-penetration weld is used or required (see Q.7.1.1). Butt-welds in annular plates shall be not closer than 12 in. from any vertical weld.

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